docs: add MCP observability guidance #2799

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	15s
checks / test (3.13, locked, ubuntu-latest)	58s
checks / test (3.11, lowest-direct, windows-latest)	1m 20s
checks / test (3.14, lowest-direct, windows-latest)	1m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, locked, windows-latest)	1m 43s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.13, locked, windows-latest)	1m 31s
checks / test (3.10, locked, windows-latest)	1m 32s
checks / test (3.13, lowest-direct, windows-latest)	1m 41s
checks / test (3.10, lowest-direct, windows-latest)	1m 22s
checks / test (3.14, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, locked, ubuntu-latest)	56s
checks / test (3.12, lowest-direct, windows-latest)	2m 9s
checks / test (3.14, locked, windows-latest)	2m 47s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.11, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, locked, windows-latest)	1m 30s
checks / test (3.14, locked, ubuntu-latest)	1m 56s
checks / test (3.12, locked, ubuntu-latest)	1m 2s
checks / test (3.11, locked, ubuntu-latest)	57s
all-green	3s
	28m 0s

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